What solar costs in District of Columbia
Berkeley Lab does not have enough reported installations in District of Columbia to publish a reliable local price, so the figures below use the national median. Treat them as a starting point, not a quote.
The numbers
High electricity prices make solar pay faster, so a red figure in the third box is good news for a solar buyer and bad news every other month of the year.
Holding a quote above $30,000? Installers in Washington DC price the same system very differently. Two more bids is the cheapest way to find out where yours sits.
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What the roof makes month by month in Washington
A 2.0 to 1 swing across the year, which is fairly typical. Expect to export in summer and import in winter, and check how your utility settles the difference.
Figures are for an 8 kW array at 20 degrees facing south, modelled from NSRDB radiation data at Washington.
What different sizes cost in District of Columbia
| Size | Panels | Price | Output | Year one saving | Payback |
|---|---|---|---|---|---|
| 4 kW | 10 | $15,000 | 5,132 kWh | $1,294 | 10.5 years |
| 5 kW | 13 | $18,750 | 6,415 kWh | $1,617 | 10.5 years |
| 6 kW | 15 | $22,500 | 7,698 kWh | $1,941 | 10.5 years |
| 7 kW | 18 | $26,250 | 8,981 kWh | $2,264 | 10.5 years |
| 8 kWtypical | 20 | $30,000 | 10,264 kWh | $2,588 | 10.5 years |
| 10 kW | 25 | $37,500 | 12,830 kWh | $3,234 | 10.5 years |
| 12 kW | 30 | $45,000 | 15,396 kWh | $3,881 | 10.5 years |
| 15 kW | 38 | $56,250 | 19,245 kWh | $4,852 | 10.5 years |
| 20 kW | 50 | $75,000 | 25,660 kWh | $6,469 | 10.5 years |
Payback is the same at every size because this table holds the price per watt flat at the national median of $3.75: price and output both grow in step with the system, so their ratio does not change. Real quotes are not quite linear. Permitting, design and connection cost roughly the same on any roof, so a small system usually costs more per watt and a large one less, and pays back correspondingly later or sooner than shown.
District of Columbia has too few reported installations for a local median, so the price is the national median of what households paid on host-owned systems installed in 2024-2025, compiled by Berkeley Lab. Local quotes can sit well above or below it.
7 programmes in District of Columbia
The 30% federal credit ended for installations completed after 31 December 2025. These state, utility and local programmes are unaffected by that, and are now the only thing that reduces the price.
| Programme | Type | Run by | Reach | Updated |
|---|---|---|---|---|
| District of Columbia Property Assessed Clean Energy Financing | PACE Financing | State | statewide | January 2, 2024 |
| Interconnection Standards | Interconnection | State | statewide | May 21, 2024 |
| Net Metering | Net Metering | State | statewide | March 6, 2026 |
| Solar Access Law | Solar/Wind Access Policy | State | statewide | August 15, 2024 |
| Solar Energy System and Cogeneration System Personal Property Tax Credit | Property Tax Incentive | State | statewide | March 20, 2026 |
| Solar Renewable Energy Credits | Solar Renewable Energy Credit Program | State | statewide | March 20, 2026 |
| Solar, Storage, and Electric Vehicle Charging Real Property Tax Exemption | Property Tax Incentive | State | statewide | March 20, 2026 |
Programme index from DSIRE, N.C. Clean Energy Technology Center, NC State University, licensed CC BY-SA 4.0. “Partial” means it reaches only some utilities or counties. A listed programme can still be closed or out of budget, so check its own page before counting on it.
How Washington DC ranks
Closest on payback: Rhode Island (9.7 yrs), California (10.5 yrs), New Hampshire (10.5 yrs), New Jersey (10.6 yrs).
Solar in District of Columbia, answered
How much do solar panels cost in District of Columbia?
An 8 kW system in District of Columbia, roughly 20 panels, costs about $30,000 before incentives. That is based on $3.75 per watt, the national median from Lawrence Berkeley National Laboratory for 2024-2025, because too few District of Columbia installations are reported to publish a local figure. There is no longer a federal tax credit to subtract from that figure.
Is there still a 30% solar tax credit in District of Columbia?
No. The federal Residential Clean Energy Credit under Internal Revenue Code section 25D was terminated by the One Big Beautiful Bill Act for expenditures made after 31 December 2025, and it did not step down first. A District of Columbia homeowner buying a system with cash or a loan today receives no federal tax credit. Under a lease or power purchase agreement the credit survives as section 48E but belongs to the company that owns the equipment, not to the household. District of Columbia still has 7 state, utility or local programmes covering rooftop solar.
How long do solar panels take to pay for themselves in District of Columbia?
About 10.5 years in District of Columbia. An 8 kW system costs roughly $30,000 and saves about $2,588 in its first year at the state's average residential rate of 25.21 cents per kilowatt-hour (EIA, July 2026). That calculation includes no federal tax credit, because the residential credit ended after 31 December 2025.
How much electricity does a solar panel produce in District of Columbia?
Each kilowatt of panels in District of Columbia produces about 1,283 kilowatt-hours a year, modelled at Washington facing south at a 20 degree tilt using NSRDB radiation data. An 8 kW system therefore makes roughly 10,264 kilowatt-hours a year. The national average is about 1,332 kilowatt-hours per kilowatt installed.
Is solar worth it in District of Columbia?
It depends less on sunshine than on your electricity price. In District of Columbia power costs 25.21 cents per kilowatt-hour (EIA, July 2026), which makes an 8 kW system pay for itself in about 10.5 years and clear roughly $52,748 over 25 years. Solar from your own roof works out at 12.4 cents per kilowatt-hour over its life, against 25.21 cents from the utility.
How many solar panels do I need in District of Columbia?
A typical District of Columbia installation is about 20 panels, which is 8 kW at the 400 watt module that is now standard and needs roughly 440 square feet of roof. To size it to your own use, divide your annual kilowatt-hours by 1,283, which is what each kilowatt of panels produces in District of Columbia each year.
Do solar panels work in winter in District of Columbia?
Yes, but output falls sharply. In Washington a kilowatt of panels makes about 135 kilowatt-hours in May and about 67 in Dec, a swing of 2.0 to 1 across the year. A system sized to cover your annual consumption will therefore run a surplus in summer and leave you buying power in winter, so how your utility settles that difference matters as much as the size of the array.
Three competing quotes beat any amount of comparing panel brands
Sales cost and margin are over a third of an installed price in District of Columbia, and they are the part that competition removes. A single quote from whoever reached you first is how people end up in the top quarter of what their neighbours paid.
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Prices and rules change. We will tell you when they do
Berkeley Lab publishes installed prices once a year, the EIA updates electricity rates every month, and Congress changed the tax treatment of all of this in 2025. One email when something on this site actually changes, and nothing else.
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